Sredneye (Russian: Среднее) is a salt lake in Aleysky District, Altai Krai, Russian Federation.

The lake lies roughly in the middle of the Krai. The nearest towns are Urlapovo and Borovskoye near the eastern lakeshore. Aleysk, the district capital, lies 43 kilometers (27 mi) to the southeast.

Sredneye is in the area of the sources of the Barnaulka river. It lies in one of the wide ravines of glacial origin that cut diagonally across the Ob Plateau slanting towards the Ob River. The lake has an elongated shape, stretching roughly from northeast to southwest for over 6 kilometers (3.7 mi). It is connected by a channel with Bakhmatovskoye lake to the northeast. The lake is shallow and the bottom is flat and mostly silty.

Lake Zerkalnoye is located in the same trench 9 kilometers (5.6 mi) to the southwest and Gorkoye 43 kilometers (27 mi) further away in the same direction.

The ribbon pine forest characteristic of the Ob Plateau grows in places close to the lake. Reeds and cattails are found in sections of the lakeshore.

• List of lakes of Russia

• Peculiarities of Macrozoobenthos in Lakes of Different Mineralization of the Southern Section of the Ob-Irtysh Interfluve